JPH0534819Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a feed bar positioning device for a transfer press, and more particularly, to a stop mechanism for a feed bar that conveys a workpiece.

[Conventional technology]

For transfer presses that have a structure in which the feed bar that conveys the workpiece is taken out together with the bolster when changing molds, it is necessary to stop the feed bar at the midpoint of the feed stroke. As such a transfer press, for example, those shown in FIGS. 7 and 8 are known.

In this transfer press, as shown in FIG. 7, two parallel feed bars 21 for conveying the blank B are provided on a bolster 22 and located at the center of each column 23. This feed bar 21 is the main motor (not shown) of the press body.
It is designed to move back and forth in conjunction with a press lifting device (not shown) operated by
(See Publication No. 55-14227). That is, as shown in FIGS. 7 and 8, the feed bar 21 conveys the work in the order of lift → advance → down with the blank B clamped (held) by a pair of fingers 24 facing each other, and the workpiece is conveyed in the order of lift → advance → down. After unclamping the workpiece (the state shown in Figure 7), return to the original position.

[Problem that the invention attempts to solve]

However, conventionally, in order to carry the feed bar 21 out of the press together with the bolster 22, a timing switch that synchronizes with the crank angle, a proximity switch that extracts a signal from the feed bar 21 itself, etc. are used in anticipation of coasting due to the inertial force of the feed bar 21 and other parts. The user was trying to stop the feed bar 21 at the midpoint of the feed stroke (the reciprocating distance of the feed bar). However, it has not been possible to ensure the midpoint stopping accuracy of the feed bar 21 due to variations in the timing at which the stop signal is issued and variations in the coasting distance from when the stop signal is issued until the vehicle stops. As a result, when changing the mold, the feed bar 21
Even if an attempt is made to take out the feed bar 21 along with the bolster 22 in the direction of the arrow in FIG.
There was a problem that the locating hole could not be inserted correctly and it could not be removed.

[Purpose of invention]

The present invention was made to solve the above-mentioned problems, and its purpose is to provide a feed bar positioning device for a transfer press that can accurately stop the feed bar at the midpoint position of the feed stroke. be.

[Means for solving problems]

In order to achieve the above object, the present invention is a transfer press in which the feed bar that conveys the workpiece is stopped at approximately the midpoint of the feed stroke and taken out of the press body together with the bolster when changing the mold. A drive device that moves the plate that moves together with the feed bar, and a plate that moves together with the feed bar is detected by a front side position detection sensor and an overshoot side position detection sensor that are fixed to the press body, or the plate that is fixed to the press body moves together with the feed bar. a detection means for detecting the position of the feed bar by detecting it with a near side position detection sensor and an overshoot side position detection sensor; It is composed of a control device that issues a drive command to the drive device as shown in FIG.

[Effect of invention]

According to the present invention, even when the feed bar is coasting and the plate is in a position where it is not detected by both the near side position detection sensor and the overshoot side position detection sensor, the feed bar receives a drive command from the control device. A drive unit moves the plate so that it is detected by both sensors. Therefore, the coasting of the feed bar integral with the plate is corrected and the feed bar stops at the midpoint of the feed stroke.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a feed bar positioning device for a transfer press according to this embodiment.

In the figure, P is a press body, columns 1 are erected at its four corners, a bolster 2 is movably provided in the center of the press body P, and a mold K is fixed to this bolster 2. A blank (work) is placed on the bolster 2 by pinching it with fingers 3A.
Two parallel feed bars 3 for conveying B are provided. An auxiliary feed bar 4 is connected to the feed bar 3 in a separable manner, and a slider 5 is integrally connected to the auxiliary feed bar 4. The slider 5 is provided with a planetary gear device 6, and this planetary gear device 6 is connected to a slow motor (drive device) 8 via a connecting gear 7. The planetary gear device 6 has a sun gear 6A and a planetary gear 6B.
B rotates around the sun gear 6A, so that the slider 5 can reciprocate in the blank advancing direction by a feed stroke S.

A plate 9 is provided on the side of the slider 5, and facing the plate 9 are a front side proximity switch (front side position detection sensor) 10A and an overshoot side proximity switch (overshoot side position detection sensor) 10A.
B is fixed to the press body P. Plate 9
Instead of detecting the position of the feed bar 3, the position of the feed bar 3 is detected by the near side proximity switch 10A and the overshoot side proximity switch 10B. A detection means 11 is constituted by the plate 9, the near side proximity switch 10A, and the overshoot side proximity switch 10B.

12 is a control device, which is a front proximity switch 10A.
and overshoot side proximity switch 10B, and connects to slow speed motor 8 so that when plate 9 is not detected by front side position detection sensor 10A and overshoot side position detection sensor 10B, it is detected by both detection sensors 10A, 10B. It gives drive commands.

Next, the operation in which the feed bar 3 stops at the midpoint position of the feed stroke S (the position indicated by the two-dot chain line in FIG. 1) when changing the mold will be explained with reference to FIGS. 4 to 6.

When the operation of the press body P stops, at a predetermined angle before the midpoint of the feed bar 3, a stop signal is received from a timing switch synchronized with the crank angle, and the slow motor 8 rotates forward, and the feed bar 3
moves a certain coasting distance and then stops (Fig. 4,
point A).

Next, as shown in the flowchart of FIG. 6, a timer (not shown) is set (S1), and the slow motor 8 is rotated normally (S2). At this time, the plate 9 is outside the detection range of the front proximity switch 10A (FIG. 5a). When the front proximity switch 10A is turned on ((S3), Fig. 5b), the process advances to S4 and the plate 9
It is determined whether or not it is within the detection range of the overshoot side proximity switch 10B. When the overshoot side proximity switch 10B is turned on in S4, the slow speed motor 8 is turned off ((S6), Fig. 5d). If the near side proximity switch 10A is OFF in S3, the state shown in FIG. 5a is reached, and the process advances to S5. If the timer has not elapsed for a predetermined period of time, the process returns to S2 and repeats the above operation.

If the overshoot side proximity switch 10B is OFF in S4, the state shown in FIG. If the predetermined time has elapsed in S5, the slow motor 8 is stopped (S6). After the slow speed motor 8 has stopped, the overshoot side proximity switch 1
ON/OFF of 0B is determined (S7). When it is in the OFF state, return to S2 and repeat the above operation. That is,
As shown in Figure 4, the slow speed motor 8 is turned on and off.
By repeating the operation, the plate 9 performs a so-called caterpillar operation, in which the plate 9 repeats an inching operation in which it operates for a certain period of time and then pauses for a certain period of time.

If the overshoot side proximity switch 10B is ON in S7, proceed to S8 and turn on the near side proximity switch 10A.
ON/OFF is determined. When ON, proceed to S9,
Stopping of the feed bar 3 at the midpoint position is completed.
When it is OFF, the process proceeds to S10, the slow speed motor 8 rotates in the reverse direction (Fig. 5 e), and the plate 9 moves back toward the near side proximity switch 10A (Fig. 4 c,
d).

Next, in S11, turn on the near side proximity switch 10A.
ON/OFF is determined. When it is OFF, the slow speed motor 8 continues to rotate in reverse, and when it is ON, the process advances to S12, where it is determined whether the overshoot side proximity switch 10B is ON or OFF. When ON, proceed to S13 and feed bar 3
The stop at the midpoint position is completed. When it is OFF, it returns to S1 and repeats the same operation.

According to the above configuration, the feed bar 3 coasts and the plate 9 is connected to the near side proximity switch 10A.
Or even if it is in a position where it is not detected by the overshoot side proximity switch 10B (Fig. 5 a, b, c, e),
The feed bar 3 moves in the direction of the arrow in FIG. 5 so that the plate 9 is detected by both the near side proximity switch 10A and the overshoot side proximity switch 10B. Therefore, the plate 9 is in a position where it can be detected by the near side proximity switch 10A and the overshoot side proximity switch 10B (FIG. 5d). As a result, the coasting of the feed bar 3, which is integral with the plate 9, is corrected and the feed bar stops exactly at the midpoint of the feed stroke S (FIG. 4). Therefore, even if there are variations in the coasting distance (the position of point A in FIG. 4 is not constant), the accuracy of stopping the feed bar 3 at the midpoint can be ensured, and the feed bar 3 can be moved together with the bolster 2 to the press body P. When taking it out to the outside, there is no possibility that the positioning hole of the feed bar 3 will not fit into the locating pin of the feed bar holder.

Furthermore, as shown in FIG. 4, the feed bar 3 integrated with the plate 9 moves in a caterpillar motion from the position of point A, so the inertia of the feed bar 3 is reduced, making it easier to achieve the above effect. ing.

In this embodiment, the slider 5 is moved by using the slow motor 8 as a drive device, but the slider 5 can also be moved directly by using a hydraulic cylinder or a pneumatic cylinder.

Further, in this embodiment, the plate 9 is provided on the slider 5, and the front side position detection sensor 10A
The overshoot side position detection sensor 10B is fixed to the press body P, and while the plate 9 is fixed to the press body P, the front side position detection sensor 10
A and an overshoot side position detection sensor 10B can also be provided on the slider 5.

Furthermore, in this embodiment, the near side proximity switch 10A is provided as the near side position detection sensor, and the overshoot side proximity switch 10B is provided as the overshoot side position detection sensor. Instead, a limit switch can also be provided.

[Effect of idea]

As described above, according to the present invention, it is possible to accurately stop the feed bar at the midpoint position of the feed stroke. The effect is that the midpoint stop device can be accurately activated.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of a feed bar positioning device for a transfer press (advanced state) according to an embodiment of the present invention, and FIG. 2 is a plan view showing the entire feed bar positioning device for a transfer press (advanced state). (advanced state), Figure 3 is a front view of the transfer press feed bar positioning device, Figure 4 is an explanatory diagram showing the movement of the plate, Figure 5 is an explanatory diagram showing the moving state of the plate, and Figure 6 is the control A flowchart showing the contents, FIG. 7 is a plan view of a conventional transfer press, and FIG. 8 is a side explanatory view showing the movement of the feed bar. 1... Column, 2... Bolster, 3... Feed bar, 4... Auxiliary feed bar, 5... Slider, 8... Slow speed motor, 9... Plate, 10
A... Front side proximity switch, 10B... Overshoot side proximity switch, 11... Detection means, P... Press body, S... Feed stroke.

Claims (1)

[Scope of claim for utility model registration] When replacing the mold, the feed bar that conveys the workpiece is stopped at approximately the midpoint of the feed stroke,
In the transfer press, which takes out the feed bar to the outside of the press body together with the bolster, the drive device that moves the feed bar and the plate that moves together with the feed bar are detected by a front side position detection sensor and an overshoot side position detection sensor fixed to the press body. Alternatively, a means for detecting the position of the feed bar by detecting a plate fixed to the press body with a front side position detection sensor and an overshoot side position detection sensor that move together with the feed bar; A feed bar positioning device for a transfer press, comprising: a control device that issues a drive command to a drive device so that it is detected by both detection sensors when the position is not detected by the position detection sensor;